Kleg was a Ledosian flight instructor in charge of giving piloting lessons and tests to those who broke the flying rules of his planet, Ledos. In 2378, while the USS Voyager was visiting Ledos, Tom Paris had to endure a flight safety course with Kleg following a flying violation. While Paris was being instructed by Kleg, he received orders from Captain Janeway to rescue an away team on the planet. After breaking almost every Ledosian airspace law, Paris saved the away team. Kleg announced that Paris had failed the course, and would no longer be allowed to pilot a vessel in Ledosian space. (VOY: "Natural Law")